Stamping-press



(No Model.) j .2 sheetssheet 1.

T, A. DIGKS. STAMPING PRESS.

PatentedJam soi 1894. y

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I" f u (No Model.) 2 Sheets-fShee-t 2.

T. A. DICES. STAMPING PRESS.

No. 513,636. Patented Jan. 30, 1894.

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Y THOMAS A. DIOKS, OF BUFFALO, NEV YORK.

STAM PING-PRESS.

SPECIFICATION forming part of Letters Patent No. 513/;636, dated January30, 1894. Application filed March 13, 1893. Serial No. 465,708. (Nomodel.)

To all whom it may concern:

Beit known that I, THOMAS A. DICKS, a subject of the Queen of GreatBritain, residing at Buffalo, in the county of Erie and State ofNewYork, have invented new and useful Improvementsin Stamping-Presses,of which the following is a specification.

This invention relates to sheet metal stamping presses and similarmachines and has the object to provide the same with means forautomatically pushing aside the operators hands before the punch strikesthe die to prevent injury tothe same. V

In the accompanying drawings consisting of two sheetsz-Figure lis a sideelevation of a stamping press provided with my improvement. Fig. 2 is afront elevation thereof. Fig. 3 is a sectional elevation of the press inline 3 3, Fig. 2. Figs. 4t, 5, 6 and '7 are fragmentary perspectiveviews showing several modifications of my invention.

The main frame of the press consists of two standards A A, cross piecesa connecting the standards, and a table B having a central opening b. y

O represents the die which is secured upon the table in any'suitablemanner. As shown in Fig. 3 this die is provided with a central opening cwhich is arranged over the opening of the table.

D represents the punch arranged above the die and adapted to co-operatewith the latter.

This punch is secured to a vertically movable cross head d which slidesin guides CZ', arranged on the front side of the standards. V

E represents the crank shaft journaled in bearings e at the upper end ofthe standards and havingits crank connected with the cross head d by arod f. This crank shaft is provided at one end with a driving pulley fand a suitable clutch for uncoupling the driving pulley from the crankshaft, when the punch is in its raised position.

In cutting or stamping plain work, the blank after it is cut from thesheet of metal, drops through the openings in the die and the table asrepresented in Fig. 3, while in embossing sheet metal, a solid die isused from which the article is removed by hand after it is ernbossed orstamped.

It frequently happens that the hands or fingers of the operator areinjured between the prevent the hands of the operator or any obstructionfrom remaining upon the die during the downward movement of the punch,amovable guard device is provided which is constructed as followsz-Grepresents an open annular guard frame arranged above the die andadjacent thereto and supported by depending arms g from a horizontallyreciprocatin g slide H. The latter is arranged in rear of the punch,between the standards, and is guided in horizontal ways h arranged onthe inner side of the standards. I represents a grooved cam whichoperates the guide frame and which is secured to the end of the crankshaft opposite to which the driving pulley is secured. Motion istransmitted from the grooved cam to the guard frame by an upright rocklever J which latter is pivoted between its ends to the main frame. Theupper armvof the rock lever is provided with a roller j, which engageswith the grooveof the cam I, and its lower arm is provided witha slotj', which receives a laterally projecting pin L7'2 secured to theadjacent side of the guard frame. When the punch is raised to itshighest position, the guard frame is in its rearward position, asrepresented in Fig. 3, in which position the blank is placed upon thedie. During the first portion of the downward movement of the punch, theguard frame moves forward and pushes away the hands of the operator ifthe same are between the die and punch. At the end of its forwardmovement, the guard frame remains at rest for a time, during which thepunch passes through the opening in the guard frame and stamps or cutsthe blank placed on the die and then rises again. During the lastportion of the upward movement of the punch, the guard frame returns toits rearward position in which it clears the die. K represents anadjustable bracket which supports the rock lever and which, is composedof an upper horzontalarm 7o', and a lower vertical arm k2 having avertical slot k3. This bracket is secured to the main frame by bolts 7a4passing through the slotof its lower arm. The rock lever is provided`with a vertical slot Z which receives a pivot bolt Z attached to theupper arm of the bracket. When it is desired to increase or decrease thethrow of the guard frame, the pivot. bolt Z and the bracket bolts 104are loosened and the bracket is shifted vertically, whereby the fulcrumof the rock lever is shifted, the bolts being again tightened aftereffecting the adjustment.

When a solid die is employed, only the movable guard frame above the dieis necessary to protect the operator against injury, but when an opendie is employed, from which it is sometimes necessary to remove scrap,an additional guard is preferably arranged within or underneath the die,which is constructed as followsz-M represents a vertically movableguardplate which is arranged in the opening of the die and which rises into ahorizontal position during the forward movement of the guard frame so asto push the fingers of the operator out of the opening in the die, andthen descend out of the way to permit the stamped sheet of metal to dropthrough the die. This guard plate is pivoted at its front end to theupper end of a vertically movable supporting rod m which latter isguided with its lower end in a bracket m secured to the under side ofthe table. N represents a vertical lifting rod whereby the supportingrod and the guard plate are operated. This lifting rod is arranged in avertically movable sleeve 'n which latter is guided in the bracket m infront of the supporting rod m, and connected with said rod by ahorizontal arm n. The downward movement of the sleeve n and rod m islimited by the arm n striking the top of the bracket m', while theirupward movement is limited by a collar n2 secured to the lower end ofthe sleeve n and striking the under side of said bracket. The liftingrod is provided at its upper end with a spherical knuckle or head owhich bears against the under side of the guard plate, and at its lowerend with a collar o which is adapted to bear against the lower end ofthe guide sleeve( R represents a rock lever whereby the guard plate isoperated and which is arrangedlengthwise underneath the table. This rocklever is pivoted between its ends to a hangerr formed on the under sideof the table so as to swing vertically, and itsV front bifurcated arm isprovided with slots r which receive a transverse pin r2 secured to thelower end of the lifting rod. S represents a trip cam whereby the guardplate is raised. This trip cam is arranged lengthwise on the under sideof the slide H, and provided with an inclined front end and an abruptrear end. s-represents a vertically sliding bar guided in the rearportion of the table and provided at its lower end with a transverse pins engaging with a slot s2 formed in the rear arm of the rock lever R. s3is an upright trip arm pivoted with its lower end to the upper end ofthe sliding bar s and provided at its upper end with a roller s4 adaptedto bear against the trip cam. The trip arm is prevented from movingforward beyond a perpendicular position by a stop t formed at its lowerend in front of its pivot, and bearing against a similar stop t formedat the upper end of the sliding bar in front of said pivot. The trip armis yieldingly held against rearward movement on the sliding bar by afiat spring t2 secured at one end to the rear side of the sliding bar sand bearing at its free end against the rear side of the trip arm. Thesliding rod is held in its raised position by a spring u attached at itsrespective ends to the rear arm of the rock lever R and the under sideof the table. During the forward movement of the guard frame G the tripcam S depresses the sliding rod and thereby raises the guard platethrough the medium of the rock lever R and the lifting rod N andsupporting rod m. At the end of the forward stroke of the guard framethe trip cam has passed the roller of the trip arm which permits thesliding bar to rise under the reaction of its return spring and theguard plate to descend. I During the backward movement of the guardframe the abrupt rear end of the trip cam engages against the trip armcausing it to swing rearward on its pivot at an angle to the slidingbar, and allowing the cam to ride over it without depressing the slidingbar. As soon as the trip cam in its backward movement clears the triparm, the latter is again returned to its normal upright position bythepspring t2, preparatory to again depressing the sliding bar. Themovements of the guard plate and the guard frame are so timed that theguard plate is raised to its highest position by the time that the guardframe reaches the center of the die. In the position of the partsrepresented in Fig. 3 the lifting rod N, supporting rod m and guidesleeve n are in their lowest position and the guard plate is inclinedfrom its front toward its rear end, which position permits the stampedsheet to drop through the die. During the first portion of the upwardmovement of the lifting rod, it raises the guard plate until the latterassumes a horizontal position, while during the last portion of theupward movement of the lifting rod its collar engages against the lowerend of the guide sleeve and raises the sleeve 4and the supporting rod,together with the guard plate, until the upper surface of the latter isflush with thevtop of the die. The upward movement of the guard plate Mand the forward movement of the guard frame G are so timed that shouldthe operator place his fingers in the opening of the die during thedownward movement of the punch the fingers will be first pushed upwardoutof said opening by the guard plate M, and then forwardly off the dieby the guard frame G before the punch descends upon the die. Thefrontend of the guard plate is preferably provided with a depending hookp which is adapted to engage against an internal shoulder p formed onthe under side of the die so as to limit the upward movement of the freeend of the guard plate. As soon as the guard frame G reachesthe end ofits forward movement the guard plate drops to permit the stamped sheetto pass through the die.

In order to facilitate the dropping of the stamped plate through the diethe punch is provided in its under side with arrecess which receives apush block q and a spring q which tends to press said block downwardly.In the normal position of this push block its lower face projects belowthe face of the punch so that when the punch descends upon the die, thepush block is forced farther into its recess, and its springis strained.This causes the push block to pressdownwardly on the stamped sheet andforcev it downwardly the instant it is severed from the blank. The pushblock is preferably arranged in the rear portion of the punch so thatthe rear portion of the stamped sheet will drop slightly in adl Vance ofits front portion and thereby cause it to slide down the inclined guardplate lnore readily.

In the modified construction represented in Fig. 4 the lower arm of therock lever .lis provided with a lateral guard finger o which oscillatesbetween the die and punch. This construction is very desirable for smalldies in which only a small movement of the guard,

is necessary to sweep across the die.

In the modication illustrated in Fig. 5 the guard frame is constructedin the form of an open segment which is secured at its inner end to anupright rock shaft w, so as to swing horizontally over the die.

If desired, the guard frame may be con` structed in the form of ahorizontal spider X mounted on an intermittently rotating shaft X', andhaving its arms arranged to sweep across the topof the die, asrepresented in Fig. 6; or an endless belt y provided with arms yarranged to pass adjacent to the die, as shown in Fig. 7 may beemployed.

I claim as my invention- 1. The combination with the die and the punchmoving toward and from the same, of a movable guard for pushing asidethe hand of the operator, arranged to move adjacent to the die beforethe punch strikes the latter and to clear the space above the die, whenthe punch is raised above the same, substan! tially as set forth.

2. The combination with the die and the punch, of a movable guardarranged to pass over the die before the punch strikes the die,substantially as set forth.

3. The combination with the die and the punch, of an open guard framearranged to move over the die before the punch strikes the die,substantially as set forth.

4t. The combination with the main frame, the die and the punch, of amovable guard frame arranged to pass over the die before the latter isstruck by the punch, and a slide carrying the guard frame and moving inhorizontal guides on the main frame, substantially as set forth.

5. The combination with the die and the punch, of a movable guardarranged to pass over the die, and a cam whereby the guard is actuated,substantially as set forth.

6. The combination with the die and the punch, of a movable guardarranged to pass over the die, a rock lever having one arm connectedwith the guard and a cam engaging with the other arm of the rock lever,substantially as set forth.

7. The combination with the main frame, the die and the punch, of amovable guard arranged to pass over the die, a rock lever having one armconnected with said guard, a cam engaging with the other arm of the rocklever and an adjustable bracket secured to the main frame and supportingthe rock lever, substantially as set forth.

8. The combination with the main frame, the die and the punch, of amovable guard arranged to pass over the die and provided with alaterally projecting pin, a rock lever provided with a slot at its lowerend which receives the pin of the guard frame and with a slot near itsmiddle, a cam engaging with Y the upper end of the rock lever, a bracketprovided with a vertical slot and secured to the main frame by boltspassing through said slot, and a pivot bolt securing the rock lever tothe bracket and passing through the middle slot of the rock lever,substantially as set forth.

9. The combination with an open hollow die and a punch, of a lingerguard arranged to move upward within the die to push out the fingers ofthe operator, substantially as set forth.

10. The combination with a hollow die and a punch, of a guard arrangedto move upward in the die, and a movable guard arranged to pass over thedie, substantially as set forth.

11. The combination with the hollow die and the punch, of a verticallymovable guard plate arranged within the hollow die, and a lifting rodwhereby said plate is raised, substantially as set forth.

12. The combination with the hollow die and the punch, of a verticallymovable sup-k lifting rod bearing against the free portion of said guardplate, substantially as set forth.

13. The combination with the main frame, the hollow die and the punch,of a bracket secured to the main frame, a vertically movable supportingrod guided in said bracket, a guard plate pivotedat one edge to theupper end of the supporting rod, a vertically movable sleeve guided insaid bracket and connected with the supporting rod, and a verticallymovable lifting rod arranged in said sleeve and bearing with its upperend against said plate, substantially as set forth..

14. The combination with themain frame, the hollow die and the punch, ofa bracket secured to the main frame, a vertically movable supporting rodguided in said bracket, a

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guard plate pivoted at one edge to the upper end of the supporting rod,a vertically movable sleeve guided in said bracket and connected withthe supporting rod, a vertically movable lifting rod arranged in saidsleeve and bearing with its upper end against said plate, a stop forlimiting the upward movement of said sleeve, and a stop arranged on thelifting rod and adapted to strike the lower end of said sleeve,substantially as set forth.

15. The combination with the main frame, the hollow die and the punch,of a vertically movable guard plate arranged within the die, a guardframe arranged to pass over the die, and connecting mechanism wherebythe guard plate and guard frame are operated relatively to each other,substantially as set forth.

16. The combination with the main frame, the hollow die and the punch,of a vertically movable guard plate arranged within the die, a guardframe adapted to pass over the die, a slide guided on the main frame andcarrying said guard frame, a cam arranged on said slide, and connectingmechanism whereby the guard plate is operated from said cam,substantially as set forth.

17. The combination with the main frame, the hollow die and the punch,of a vertically movable guard plate arranged within the die, a guardframe adapted to pass over the die, a slide guided on themain frame andcarrying said guard frame, acam arranged on said slide, a rock leverpivoted to the main frame, a lifting rod bearing with its upper endagainst the guard plate and connected at its lower end with one arm ofthe rock lever, and a sliding bar connected at its lower end with theother arm of the rock lever and bearing with its upper end against saidcam, substantially as set forth.

18. The combination with the main frame, the hollow die and the punch,of a vertically movable guard plate arranged within the die, a guardframe arranged to reciprocate Over the die,a slide guided on the mainframe and carrying the said guard frame,a cam arranged on said slide andprovided with an inclined front side and al1 abrupt rear side, a rocklever pivoted to the main frame and a sliding bar guided in the mainframe and connected at its lower end to the rear arm of the rock lever,and a trip'arm pivoted at its lower end to the upper end of the slidingbar and bearing with its upper end against said cam, a stop for limitingthe forward swing of the trip arm, and a spring whereby the trip arm isyieldingly held against backward Inovernent, substantially as set forth.

19. The combination with an open or hollow die, through which the cutblank is discharged, of a vertically movable guard plate arranged insaid die, and a punch having a yielding push block or follower forpushing the cut blank through the hollow die, substantially as setforth.

20. The combination with the hollow die through which the cut blank isdischarged, of avertically swinging guard plate arranged in said die andpivoted at one edge, and a punch having a yielding push block orfollower adapted to push the cut blank through the die and exerting itspressure against the blank on one side of the center of the punch,substantially as set forth.

Witness my hand this 11th day of March, 1893.

THOMAS A. DICKS.

Witnesses:

JNO. J. BONNER, EMIL NEUHART.

